var speed=20;  //数字越大文字滚动速度越慢
var tab=document.getElementById("demo");
var tab1=document.getElementById("demo1");
var tab2=document.getElementById("demo2");

tab2.innerHTML=tab1.innerHTML;
function Marquee(){
    if(tab2.offsetWidth-tab.scrollLeft<=0)
        tab.scrollLeft-=tab1.offsetWidth
    else{
        tab.scrollLeft++;
    }
}
var MyMar=setInterval(Marquee,speed);
tab.onmouseover=function() {clearInterval(MyMar)};
tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};

var onOff = true;
//var Time = setInterval(Chang,3000);
//function Chang(){
//    if(onOff){
//        oFig.style.marginLeft='-100%';
//        onOff = false;
//    }else{
//        oFig.style.marginLeft='0';
//        onOff = true;
//    }
//}
